He who fails to plan plans to fail

As Winston Churchill said (and famously paraphrased by a certain Roy Keane years later) "He who fails to plan plans to fail". This applies to any task that is more than trivial. Whether it is creating a new lawn or installing pureScale...

If you are going to be installing pureScale then the installation itself is really easy. Where the preparation comes in is in getting the environment set up beforehand. I strongly recommend that you take a careful look here at the DB2 infocenter "Planning for a IBM DB2 pureScale Feature for Enterprise Server Edition deployment" . This should be your first step towards installing pureScale and done before any of the logistics can fall into place. There are various considerations and checklists here such as:

Using a user managed file system or allowing pureScale to create one (I recommend the latter).

DB2 client considerations. Essentially to help you figure out what kind of client connectivity you want (workload balancing, Automatic client reroute etc.)